Dobby lever for looms



Dec. 26, 1933. R HOLMES 1,941,005

DOBBY LEVER FOR L OOMS Filed July 3, 1931 Slbridge R. Hoh'qes attorneys i UNITED STATES; PATENToFF-I E Crompton & Knowles Loom .Works, Worcester, Mass, a corporation of Massachusetts Application July 3,1931; Serial No. 548,604

Claims. (01. 139-44)" This invention relates to improvements in Fig, 6 is a front elevation of a modified form of dobby levers for looms and it is the general obthe invention, I ject of the invention to provide a lever. so con- Fig. 7 is an end elevation taken in the direce' structed as to have improved wearing qualities. tionof arrow 7, Fig. 6, and 1 v In (lobbies employing reciprocating knives the, Fig. 8 is'a rear elevation taken in the direction harness lifting jack is pivoted around a fixed opposite to that in which Fig. 6 is taken. 1 I center and has connection with the mid-point of 7 Referring to Fig. 1, I have shown a dobby a dobby leverheld normally against cross girts.- frame 10 having a fixedpivot 11 about which Hooks are pivoted to the upper and lower ends of moves a harness jack 12. The latter has;har-

10 the lever and the oppositely moving knives travel nesscordreceiving notches or teeth 13 and has in fixed paths to engage anylhook which is down. a substantially horizontally extending arm 14.

If the upper end of thelever is moved outwardly The. dobby has upper and lower slide guides 15 for instance, the lower; end bears against the, and '16, respectively, 'in which-reciprocate in op,-' bottom girt as a fulcrum, butthe fulcrum moves posite directions top and bottomlifter :knives 1.5 or slides along the girt because oi the angular. 17 and 18, respectively. Top and bottom cross I i girts 19 and-20, respect-ively, are located in the The dobby lever shown in my previous Patent usual position and are secured to the dobby I No. 1,451,828 has .a pair of. spring members framesoas to be fixed with respect-t0 the loom.

fastened together but with their ends spaced; to A dobby lever 21 is pivoted, as at 22 to the 20 receive .a dobby hook. It is an important obhorizontalarm 14 of the jack and supports upject of my-present invention toprovide addiper and lower hooks 23 and 24, respectively.. Pattional bearing means carried by the lever and ex tern mechanism not shown but well understood tending from one member to theiother. In this controls the position of said hooks so that cerconnection the bearing. means transmits the ,tain of them will be down to be engagedby the movement of the jack. l e

2 bearing strains to both lever forming members. knives while others will be raisedto; be'clear- '80 Where the strain placed uponthe harness of the latter. The dobby 'operatesin'the usual frames is large due to heavy warp'the hooks are manner and except for the ends of the lever 21, subject to wear and occasionally needreplacemay be of usualconstruction. V 5 ment. 7 Renewal of adefective hook is accom- 7 Referring particularly to Figs. 2 to 5, inclusive," 7

3 plishedin the type of lever Previou y re erred to. I have shown the preferredform of my invenby separating the spring ends, and it is another tion which includes a pair of steel spring-memobject of my present invention to provide a bearbers 30 and 31 held together by rivets 32,;see ing surface of increased width which shall per- F g. at points substantially removed from 'mit the separation of the endsof the members 1 the ends of the lever. ,AS Shown in Fig. 3,. one, without requiring any manipulation of the bears Of S m s ha its 8 Offset $0 s t 616-" 9c ing when said ends spring back together. r fine @1100}! recelvme pace ,33. That part ofthe With these and other objects in view which will lever "al a d 0I d,,L y be [the same as appear as the description proceeds, myinvenshown'rm Pater/11" 1451;8284 tion resides in the combination and arrangement h In hQa- PQ e h spn of parts hereinafter described and set forth' in of -.1tS'rOunded edges prov-med .wlth'aflnotchllm the claims 111119711119 Fih em 31 15 provided. W e

adr lugs 41 and 42; Above the lug 41 is anotcn In the ac p p ifi ll flg W e1 r43andfsnnilarly below lugfl42 is a second notch .5 is "f titaneastwam.-

made. according en invention" 1 li gr i r l g z rizei'fi l s lit 51 and 52' which" 2 is from; Y 'g mfii-i upper 5 d of I are adapted to enter notches 43 and 44 respec-' b levgtma e a000,? 22 inven 4m -"tivel andyalso has notches 53 and 5 4 e- 343 an @1101 l i n. taken n t direct recei 'i e the lugs 41 and" 42, respectively.' %l 1 e g,-2; v i v r a side 55' of the bearing entersthe notch 45 in the 05 F le-. 15 a we of h -rev se d s t lever member 31. The" various lugs and their 1 2 1 gq i F p h H Y 7 notches may be dovetailed'ato insure g0od'hold-"" I 1g. is aerounv ws m e mp ing engagement between the-bearin means or -Parts separated and indicating the method of" membersd m b I r their assembly, r The opposite side of'the bearing member 50 is provided 'with an elongated lug 60 which is adapted to lie within the notch 40, there being upper and'lower stop surfaces 61 and 62, respectively, which engage the inner part of the member 50 ad- 5 jacent the notch 40 to spacesaid spring members so that they do not exert undue pressure on the hook the bearing of which is located between the members. The bearing element 50 bears against the bottom of notch 40 so as to transmit bearing strains to lever member 30.

The lugs and. notches shown in Fig. 4 and in the right hand part of Fig. 5 serve as means for securing the bearing member 50 to the lever member 31 and the notch 40 has sufiicient clearance with respect to the elongated lug 60 so that the latter may enter said notch after the ends of the lever member have been separated to receive the bearing of a hook. It is to be understood that both top and bottom ends of the lever can be formed substantially as set forth in Figs. 2 to 5, i

Y and that as the dobby levers move pivotally about one or the other of the girts 19 01 20, one of the members 50 will act to transmit pressure between the lever forming members and the corresponding girt.

In the modified form of the invention shown in Figs. 6, '7 and 8 I employ the same general type of dobby lever'80 having spring members 81 and 82 which are spaced to define a hook receiving opening 83. Secured to the member 82 eziis a bearing block 84 attached thereto by means of rivets 85. The block has an edge 86 which is. curved so as to conform to the outline of the rounded adjacent parts of the members which 5 5 define the end of the lever 80. The member 81 .has a notch 8'7 which receives a lug 88 extending from the block 84, the modified form in this respect being similar to the preferred form in having a spring member having a bearing block "/9 secured thereto and the latter having a portion .tO engage the other lever member so that both of said members can share in supporting the strain to which the bearing member is subjected.

From the foregoing it will be seen that I have provided a dobby lever formed of two sheet metal ..?parts to one of which is secured a bearing member, the latter having a part to project into a notch in theother member so that each of the lever forming members may support the bearing member. It will be seen that the preferred Ciform provides a bearing of substantially the full width. of the lever, and this bearing itself may be formed of sheet metal curved from a smooth surface to slide over the girts.

form the space between the ends of the lever is ccbridged so as to give increased wearing surface. Furthermore, the bearing is secured to one sheet metal lever part and fits into a notch in the other part so that the lever ends may be readily 3C spaced to receive a dobby hook and close easily -to hold the hook in place. Parts of the bearing hold the lever ends spaced to prevent cramping of the hook. Since the bearing element is separate from the lever members it can be heat treated for hardness without destroying the resilie nc'e of the lever members.

Having thus described my invention it will. be seen that changes and modifications may be a made therein by those skilled in the art-without departing from the spirit and scope of the in vention and I do not wish to be limited to the details hereindisclosed, but what I claim is:

1. In a dobby lever; for looms having a cross 7 girt, a pair of sheet metal members held together,

In the modified and having their adjacent ends spaced, and perforated to receive the bearing of a hook and a bearing element on one side of the lever to engage the girt and separate from said members and held to one of them and bridging the space between said ends and said element provided with a bearing surface having a width substantially equal to the distance between the opposite outside surfaces of said ends.

2. In a. dobby lever for looms having a cross girt, a pair of sheet metal lever members held together and having their'adjacent ends spaced, and perforated to receive the bearing of a hook a separate bearing element secured to one member'and extending across the spaces between the spaced ends and engaging the other member, said element positioned to transmit bearing pressure directly from both members of the lever to the cross girt.

3. In a dobby lever for looms having a cross girt, a pair of sheet metal lever members held together and having their adjacent ends spaced, and perforated to receive the bearing of a hook a separate bearing element secured to one of said members and projecting; laterally therefrom, the other member having a notch andsaidbearing member havingan extension to extend into the notch and also having engagement with that part of said other member forming the bottom of the notch to transmit pressure directly to said other member. g

4. In a dobby lever for looms having a cross girt, a pair of sheet metal lever members held together and having their adjacent ends spaced, and perforated to receive the bearing of a hook 110 a bearing element separate from said members and secured to one of said members and-projecting laterally therefrom, the other member having a notch and said bearing member having an extension to extend into the notch and also 115 having engagement with that part of said other member forming the bottom of the notch, said bearing member extending across both of the lever forming members. A Y

5. In a dobby lever for looms having across girt, a pair of sheet metal lever'members held together and having their adjacent ends spaced, and perforated to 'receive the bearing of a hook a separate bearing element secured to one member and extending across the spaces between the spaced ends and engaging the "other member, said. element positioned to transmit bearing pressure to both members of the lever, one of said members being movable with respect to the other and the bearing member in a direction away from the latter to provide spacefor entry of a dobby hook, said bearing member and the other lever memberbeing so formed as to reestablish strain-transmitting relations when said other lever member returns to its normal position after the hook is in position.

6. In a dobby lever for a loom having a cross girt and operating with a dobby hook, a pair of sheet metal lever members held together and having their adjacent ends spaced to receive a dobby hook bearing, a separate bearing element secured to one member and having a width" greater than the width of the space between the member ends and engaging the edges of both members to communicate directly toeach of said members forces exerted substantially parallel to the plane of the-lever, said bearing element having means to limit movement of one member toward the other-,thus preventing cramping of the. dobby hook. 15g

'7. In a dobby lever for looms having a cross girt, a pair of sheet metal lever forming members held together and having their ends spaced from each other and perforated to receive the bearing of a hook, abearing element secured to one member and extending across the space between the ends of the members and engaging 

